型号:SN74LS642N5
SN74LS642NE4
SN74LS642NS
SN74LS642NSE4
SN74LS642NSG4
SN74LS642NSR
SN74LS642NSRE4
SN74LS642NSRG4
SN74LS643-1N
SN74LS643N
SN74LS644-1N
SN74LS645-1DW
SN74LS645-1DWE4
SN74LS645-1DWG4
SN74LS645-1DWR
SN74LS645-1DWRE4
SN74LS645-1DWRG4
SN74LS645-1N
SN74LS645-1NE4
SN74LS645-1NS
SN74LS645-1NSE4
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